package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.servlet.http.HttpSession;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1.校验手机号
        if (RegexUtils.isPhoneInvalid(phone)) {
            //2.不符合，直接返回错误信息
            return Result.fail("手机号格式错误");
        }
        //3.符合，生成验证码
        String code = RandomUtil.randomNumbers(6);

        //4.保存验证码redis
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY+phone,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);

        //5.发送验证码
        log.info("短信验证码发送成功，验证码：{}",code);

        //6.返回ok
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1.校验手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)) {
            //2.不符合，直接返回错误信息
            return Result.fail("手机号格式错误");
        }
        //3.从redis中获取验证码并校验验证码
        String cachecode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        String code = loginForm.getCode();
        if (cachecode==null||!cachecode.equals(code)) {
            //3.不一致，报错
            return Result.fail("验证码错误");
        }
        //4.一致，根据手机号查询用户
        User user = query().eq("phone", phone).one();
        //5.判断用户是否存在
        if (user==null) {
            //6.不存在，创建新用户并保存
            user=createUserWithPhone(phone);
        }
        //7.保存用户信息到redis中
        //7.1随机生成token，作为登录令牌
        String token = UUID.randomUUID().toString(true);
        //7.2将User对象转为HashMap存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create().setIgnoreNullValue(true).setFieldValueEditor((fieldName,fieldValue)->fieldValue.toString()));
        //7.3存储
        stringRedisTemplate.opsForHash().putAll(LOGIN_USER_KEY+token,userMap);
        stringRedisTemplate.expire(LOGIN_USER_KEY+token,LOGIN_USER_TTL, TimeUnit.MINUTES);
        //7.4设置token有效期


        //8返回token
        return Result.ok(token);
    }

    @Override
    public Result sign() {
        //1.获取当前登录用户
        Long userId = UserHolder.getUser().getId();
        //2.获取日期
        LocalDateTime now = LocalDateTime.now();
        //3.拼接key
        String keySuffix=now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key=USER_SIGN_KEY+userId+keySuffix;
        //4.获取今天是本月第几天
        int dayOfMonth = now.getDayOfMonth();
        //5.写入redis
        stringRedisTemplate.opsForValue().setBit(key,dayOfMonth-1,true);
        return Result.ok();
    }

    @Override
     public Result signCount() {
        //1.获取当前登录用户
        Long userId = UserHolder.getUser().getId();
        //2.获取日期
        LocalDateTime now = LocalDateTime.now();
        //3.拼接key
        String keySuffix=now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key=USER_SIGN_KEY+userId+keySuffix;
        //4.获取今天是本月第几天
        int dayOfMonth = now.getDayOfMonth();
        //5.获取本月截止今天为止的所有的签到记录，返回的是一个十进制的数字
        List<Long> result = stringRedisTemplate.opsForValue()
                .bitField(key,
                        BitFieldSubCommands
                                .create()
                                .get(BitFieldSubCommands
                                        .BitFieldType
                                        .unsigned(dayOfMonth))//只统计该天数之前的签到，如若统计后面的天数则需更改dayofmonth
                                .valueAt(0));
        if(result==null||result.isEmpty()){
            //没有任何签到结果
            return Result.ok(0);
        }
        Long num = result.get(0);
        if(num==null||num==0){
            return Result.ok(0);
        }
        int count=0;
        while (true){
        //6.循环遍历
        //7.让这个数字与1做与运算，得到数字的最后一个bit位
            if(((num&1)==0)){
                //如果位0，说明未签到，结束
                break;
            }else {
                //如果不为0，说明已签到，计数器+1
                count++;
            }
        //把数字右移一位，抛弃最后一个bit位，继续下一个bit位
            num=num>>1;
    }
        return Result.ok(count);
    }

    private User createUserWithPhone(String phone) {
        //1.创建用户
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX+RandomUtil.randomString(10));
        save(user);
        return user;
    }
}
